Electric Connection; Establishing The Bus Connection And Temperature Sensor (Extra-Low Voltage Side); Connecting The Power Supply, Pump, Solenoid Valve Or Fault Display; Side) - Buderus EM100 Installationsanleitung

Optimised sensor installation downstream of the heat
exchanger
The temperature sensor (T0) must be mounted on the flow
downstream of the heat exchanger on the secondary side
(wet sensor) ( Fig. 24 at end of document).
There are two ways to ensure optimised sensor installation
downstream of the heat exchanger ( Item [1] with angled
screw connection and Item [2], 4):
24
A B
1
Fig. 4 Optimised sensor installation
The temperature sensor must be positioned so the
measurement is taken centrally in the pipe.
▶ Use tap extensions to adjust the installation depth of the
low loss header temperature sensor ( Installation
instructions of low loss header sensor set). If installed
correctly, the sensor projects 1-2 cm into the heat
exchanger.
3.4

Electric connection

▶ When observing the applicable regulations for the
connection, at least electrical cables of type H05 VV-....
must be used.
3.4.1 Establishing the BUS connection and temperature
sensor (extra-low voltage side)
▶ If the conductor cross-sections vary, use a junction box to
connect the BUS nodes.
If the maximum total length of the BUS connections between all
BUS nodes is exceeded or the BUS system has a ring structure,
commissioning of the system is not possible.
Maximum total length of BUS connections:
2
• 100 m with 0.50 mm
2
• 300 m with 1.50 mm
EM100 – 6721848668 (2022/05)
24
A
2
T0
0010024454-001
conductor cross-section
conductor cross-section
▶ To avoid inductive interference: Make sure all low-voltage
cables are routed separately from supply voltage carrying
cables (min. clearance 100 mm).
▶ In the case of external inductive effects (e.g. from PV
systems) use shielded cable (e.g. LiYCY) and ground one
end of the shield. |Connect the shield to the building's
earthing system, e.g. to a free earth conductor terminal or
water pipes, and not to the connecting terminal for earth
leads in the module.
When extending the sensor leads, use the following conductor
B
cross-sections:
• 0.75 to 1.50 mm
T0
• 1.50 mm
▶ Route cables through the grommets provided and connect
them as shown in the connection diagrams.
3.4.2 Connecting the power supply, pump, solenoid valve
or fault display (mains voltage side)
The assignment of the electrical connection depends on which
system is installed. The description at the end of the document
in Fig. 14 to 17 is a possible suggestion for the electrical
connection. Not all steps are shown in black. This makes it
easier to see, which steps belong together.
▶ Only use electric cables of the same quality.
▶ Make sure the power supply is connected to the correct
phases. Connecting to a main power supply via an earthed
safety plug is not permitted.
▶ Connect only components and assemblies to the outputs as
described in these instructions. Do not connect any
additional controls that operate other system components.
▶ Route cables through the grommets, connect them as
shown in the connection diagrams and secure them with
the strain relief devices included in the scope of delivery
( Fig. 14 to 17 at the end of this document).
The maximum power consumption of the connected
components and assemblies must not exceed the power output
stated in the specifications for the module.
▶ If the mains voltage is not supplied via the electronic system
of the heat source EN 60335-1, install a standard all-pole
isolator (in accordance with EN 60335-1) on site to
interrupt the mains voltage.
2
conductor cross-section for up to 20 m
2
conductor cross-section for 20 m to 100 m
Installation 3
21